I thought i was pretty plain, think about it, a cap blocks off anything, whether its a baseball cap or a pop bottle cap. I simple cap( block off) with nothing else attached is all thats needed to block off the PG, not screw anything else to it!
I have a preban bushmaster correctly registered and a couple dozen hi caps. I also have another post ban ar and ar pistol. I prefer the large cap but dont want to sacrifice the PG until i am forced to, so i use a BB for now on my post bans.
Maybe to be sure i should be clear(er)
Remove the pistol grip and put a little block off ( cap) where the PG was. Ex its REMOVED and no hammerhead or fs15 sticking out.